I haven't watched Rogue One in a good long while, but I remember it feeling rushed and disjointed. It was a visually beautiful film which seemed like it had ideas that had been muddled with by the powers that be forcing re-writes. I think I read afterwards that was the truth, but I actually could sense it just during my viewing.

Andor seemed like it reached the potential the Rogue One was aiming for. It keep the great visuals and designs, while really fleshing out the ideas.

I would say for a fresh watch, Andor first and Rogue One second will probably create some needed investment in the character that isn't contained in the movie itself.